Speaking-telephone



FQBLAKE, Jr.

, SPEAKING TELEPHONE. E

No 283,062. WPatented Aug. 14, 1883.

71% Inventor: Q

aw; y 7W 70 UNITED 3 STATES PATENT OFFICE.

EEA cIs BLAKE, JR, on WESTON, MAssAoHusETTs.

SPEAKINGQTELEPHONEI.

SPEGIFIGATION- forming, part of Letters Patent No. 283,062, dated August 14, 1883.

Application filed September 11, 1879.

To all whom, it may concern:

Be it known that I, FRANCIS BLAKE, J12, of Weston, in the State of Massachusetts, have invented an Improvement in, Speaking-Telephones, of which the following is'a specification. I

The invention relates to a formofspeakingtelephone invented by me and described in an application for a patent filed in the Patent Office January 3, 187 9; and it consists-in covering with rubber or similarmaterial the spring carrying the weighted electrode of that instru ment, whereby certain troublesome overtones, due to the vibrations of the spring, may be ayoided. I

In the drawing I have shown so much of my said instrument as will fully illustrate the present invention. l

. As in my said other applioatiomthe ring or frame for supporting the mechanism of the telephone is marked B. The diaphragm is marked 0. It rests upon a lip, b, of the ring B, being separated therefrom by a lining of paper or other suitable material, andbeing held in place, as described in said other application, by fiat springs. (Not here shown.) The ring B has two ears, B B, the ear B supporting an adjusting-levenF, which in turn carries the light spring 0, with the electrode 6, and the heavy spring d, with its weighted electrode 6, and also carries the 631F132, supporting the modified as follows:

mitted sounds.

adjusting-screw G, all as here shown, and sub stantially as shown and described in my said former application. Accordingly in this application-I make no claim to any of the devices herein described and shown, except when As before stated, the heavier spring (1, which is strong enough to keep, and does keep, the two electrodes in constant contact, notwithstanding the vibrations of the diaphragm, is covered with a tube of rubber, R, for the purpose of doing away with certain overtones, which, resulting from the vibrations of that spring, might otherwise accompany the] trans- Substantially the same effect can be obtained by coating the strip with leather, blotting-paper, or other similar softelastic material, and instead of being applied in the form of a tube, the rubber or othersoft elastic material may be cemented in strips to the fiat side or sides of the spring, or secured in any similar manner.

The spring (I, carrying an electrode and coated with rubber or similar elastic material, in

combination with the diaphragm, substantially as described.

FRANCIS BLAKE, JR.

LEwIs WALSMITH, LYCURGUS .PITMAN. 

